Ice triaxial deformation and fracture
Abstract An experimental investigation into the mechanical behaviour of polycrystalline ice in triaxial compression has been conducted using conditions generally favourable to brittle fracture and microcracking. Under triaxial stresses at high strain rate, ice failure occurs by abrupt shear fracturi...
Published in: | Journal of Glaciology |
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Language: | English |
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Cambridge University Press (CUP)
1994
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Online Access: | http://dx.doi.org/10.1017/s0022143000007395 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000007395 |
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crcambridgeupr:10.1017/s0022143000007395 2024-09-09T19:49:03+00:00 Ice triaxial deformation and fracture Rist, M.A. Murrell, S.A.F 1994 http://dx.doi.org/10.1017/s0022143000007395 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000007395 en eng Cambridge University Press (CUP) Journal of Glaciology volume 40, issue 135, page 305-318 ISSN 0022-1430 1727-5652 journal-article 1994 crcambridgeupr https://doi.org/10.1017/s0022143000007395 2024-07-31T04:01:54Z Abstract An experimental investigation into the mechanical behaviour of polycrystalline ice in triaxial compression has been conducted using conditions generally favourable to brittle fracture and microcracking. Under triaxial stresses at high strain rate, ice failure occurs by abrupt shear fracturing, generally inclined at about 45° to the maximum principal stress. At −20°C, such failure is suppressed by the imposition of a small confining pressure, allowing a transition to ductile-type flow accompanied by distributed microcracking, but at —40°C shear fracture persists under confinement of up to at least 50 MPa. For low confining pressures (< 10 MPa), brittle strength is strongly pressure-dependent; above this it is pressure-independent. Evidence is presented that suggests this may reflect a change from a fracture process influenced by friction to fracture initiated by localized yielding. Ductile yield strength is found to be little influenced by confining pressure despite the inhibition of cracking that leads to greatly contrasting observed crack densities. Flow conforms to the well-known power law for ice with Q = 69 J mol −1 and n = 4.2 over the temperature range −20° to −4-5° C Under these conditions, microcracking in ice appears to remain remarkably stable and non-interacting. Article in Journal/Newspaper Journal of Glaciology Cambridge University Press Journal of Glaciology 40 135 305 318 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract An experimental investigation into the mechanical behaviour of polycrystalline ice in triaxial compression has been conducted using conditions generally favourable to brittle fracture and microcracking. Under triaxial stresses at high strain rate, ice failure occurs by abrupt shear fracturing, generally inclined at about 45° to the maximum principal stress. At −20°C, such failure is suppressed by the imposition of a small confining pressure, allowing a transition to ductile-type flow accompanied by distributed microcracking, but at —40°C shear fracture persists under confinement of up to at least 50 MPa. For low confining pressures (< 10 MPa), brittle strength is strongly pressure-dependent; above this it is pressure-independent. Evidence is presented that suggests this may reflect a change from a fracture process influenced by friction to fracture initiated by localized yielding. Ductile yield strength is found to be little influenced by confining pressure despite the inhibition of cracking that leads to greatly contrasting observed crack densities. Flow conforms to the well-known power law for ice with Q = 69 J mol −1 and n = 4.2 over the temperature range −20° to −4-5° C Under these conditions, microcracking in ice appears to remain remarkably stable and non-interacting. |
format |
Article in Journal/Newspaper |
author |
Rist, M.A. Murrell, S.A.F |
spellingShingle |
Rist, M.A. Murrell, S.A.F Ice triaxial deformation and fracture |
author_facet |
Rist, M.A. Murrell, S.A.F |
author_sort |
Rist, M.A. |
title |
Ice triaxial deformation and fracture |
title_short |
Ice triaxial deformation and fracture |
title_full |
Ice triaxial deformation and fracture |
title_fullStr |
Ice triaxial deformation and fracture |
title_full_unstemmed |
Ice triaxial deformation and fracture |
title_sort |
ice triaxial deformation and fracture |
publisher |
Cambridge University Press (CUP) |
publishDate |
1994 |
url |
http://dx.doi.org/10.1017/s0022143000007395 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000007395 |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology volume 40, issue 135, page 305-318 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000007395 |
container_title |
Journal of Glaciology |
container_volume |
40 |
container_issue |
135 |
container_start_page |
305 |
op_container_end_page |
318 |
_version_ |
1809918443266244608 |